It shouldn't be "just a search". In other words, it should be possible to go to a web site, enter an address and find out who owns the property at that address. But the same site should not allow the user to enter the name of a citizen and get the address where that citizen lives, or who else lives at the same address. So businesses who possess the data should not be allowed to just dump the entire data into Google's search indexes, they can only allow certain narrow searches.